13261620 has 48 divisors (see below), whose sum is σ = 39090240. Its totient is φ = 3350016.

The previous prime is 13261579. The next prime is 13261621. The reversal of 13261620 is 2616231.

It is a happy number.

13261620 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4677 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (814380).

Almost surely, 2^13261620 is an apocalyptic number.

13261620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13261620 is an abundant number, since it is smaller than the sum of its proper divisors (25828620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13261620 is a wasteful number, since it uses less digits than its factorization.

13261620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11664 (or 11662 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13261620 is about 3641.6507246028. The cubic root of 13261620 is about 236.7003280385.

Adding to 13261620 its reverse (2616231), we get a palindrome (15877851).

The spelling of 13261620 in words is "thirteen million, two hundred sixty-one thousand, six hundred twenty".